Definition of have kittens
British, informal
: to become very nervous or upset about something
They had kittens when they saw the mess we made.
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have/keep (something) up one's sleeve
have kittens
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“Have kittens.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/have%20kittens. Accessed 16 Sep. 2021.
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